HarmonyOS 有safeArea吗，怎么获取

可以使用.expandSafeArea([SafeAreaType.SYSTEM], [SafeAreaEdge.BOTTOM])来解决问题。参考文档：https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V5/arkts-develop-apply-immersive-effects-V5#section202081847174413

可参考demo：

@Component
@Entry
struct index19 {
  @State  isExpand:boolean = false
  build() {
    Column({ space: 30 }) {
      Row() {
        Text('全屏').fontSize(30).onClick(() => {
          this.isExpand = true
        }).width('80%').backgroundColor(Color.Yellow).padding(20)
          .expandSafeArea([SafeAreaType.SYSTEM],this.isExpand == true ? [SafeAreaEdge.TOP]:  [SafeAreaEdge.BOTTOM])
      }
      .width('100%')
      .backgroundColor(Color.Blue)
      Row() {
        Text('非全屏').fontSize(30).onClick(() => {
          this.isExpand = false
        }).width('80%').backgroundColor(Color.Yellow).padding(20)
          .expandSafeArea( [SafeAreaType.SYSTEM],this.isExpand == true ? [SafeAreaEdge.BOTTOM]:  [SafeAreaEdge.TOP])
      }.width('100%')
      .backgroundColor(Color.Blue)
      .clip(true)
    }
    .backgroundColor(Color.Red)
    .justifyContent(FlexAlign.SpaceBetween)
    .alignItems(HorizontalAlign.Center)
    .width('100%')
    .height('100%')
  }
}